EP0687103A2
Expired / Lapsed
EP
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Color printer calibration with blended look up tables
Assignee: Xerox Corp
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Filing: 1995-06-05
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Granted: —
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Expires: 2015-06-05
Abstract
Abstract A color printer, responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, is calibrated by operating the color printer with printer signals (C p ,M p ,Y p ,K p ) selected to cause the printer to print color samples on the medium; measuring (70) the color samples to determine a first colorimetric response of the printer to the printer signals using the first measured colorimetric response to generate a first mapping of colorimetric values (R c ,G c ,B c ) to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; storing the first and additional mappings in a color conversion memory producing printer signals as a function of the first and additional mappings stored in the color conversion memory to convert color definitions from a first color space to the printer signals suitable for producing a corresponding response at the color printer.
Inventors
- 👤 Robert J. Rolleston
- 👤 Martin S. Maltz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:54
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40006; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A method of calibrating a color printer, the color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: operating the color printer with printer signals selected to cause the printer to print color samples on the medium; measuring the color samples to determine a first colorimetric response of the printer to the printer signals; using the first measured colorimetric response to generate a first mapping of colorimetric signals to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; storing the first and additional mappings in a color conversion memory; producing printer signals as a function of the first and additional mappings stored in the color conversion memory to convert color signals from a first color space to the printer signals suitable for producing a corresponding response at the color printer.
Claim 2
Independent Claim
171 words
A method of calibrating a color printer, the color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: operating the color printer with printer signals selected to cause the printer to print color samples on the medium; measuring the color samples to determine a first colorimetric response of the printer to the printer signals; using the first measured colorimetric response to generate a first mapping of colorimetric values to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; generating a color conversion mapping as a function of the first and additional mappings and storing said mapping in a color conversion memory; producing printer signals as a function of the color conversion mapping stored in the color conversion memory to convert color signals from a first color space to printer signals suitable for producing a corresponding response at the color printer.
Claim 3
Dependent Claim
172 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; printer control means for storing the first and additional mappings in the color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer.
Claim 4
Dependent Claim
190 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; means for combining at least the first measured colorimetric response and any subsequent measured colorimetric response to produce a color conversion mapping, and storing said color conversion mapping in said color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer.
Claim 5
Independent Claim
23 words
A method or device as described in any of claims 1 to 4, wherein said colorimetric signals are red, green and blue signals.
Claim 6
Independent Claim
59 words
A method or device as described in any of the preceding claims, wherein said printer signals correspond to (A) printing cyan, magenta and yellow colorants, (B) printing cyan, magenta, yellow and black colorants, (C)printing cyan, magenta, yellow and at least one additional different non-black colorant or (D) printing cyan, magenta, yellow, black and at least one additional different colorant.
Claim 7
Independent Claim
104 words
A method or device as described in any of the preceding claims, wherein the step of producing printer signals as a function of the first and additional mappings stored in the color conversion memory does so in accordance with the function: C,M,Y = A1(r,g,b) × LUT1(r,g,b) + A2(r,g,b) × LUT2(r,g,b) + A3(r,g,b) × LUT3(r,g,b) + ... + AN(r,g,b) × LUTN(r,g,b) where C,M,Y is the printer signal produced as a function of the first and additional mappings stored in the color conversion memory, AN is a color space location dependent weight and LUTN(r,g,b) is the first and additional mappings of colorimetric values to printer signals.
Claim 8
Dependent Claim
17 words
A method or device as described in claim 7, wherein A1 + A2 + A3...+ AN= 1.
Claim 9
Dependent Claim
47 words
A method or device as described in claim 7 or 8, where a single member of the set {A1, A2 + A3... + AN} is equal to 1, and the remaining member of the set are equal to 0 at any location in location in color space.
Claim 10
Independent Claim
99 words
A method of calibrating a color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: producing a calibration print as a printer response sample; deriving a first mapping relating colorimetric values to printer response; deriving at least one additional mapping relating colorimetric values to printer response; generating a color conversion mapping as a function of the first and additional mappings and storing said mapping in a color conversion memory; operating the calibrated printer with the color conversion mapping to convert colorimetric values received to printer signals.
References Cited (Backward Citations)
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